Gapfyre SWE — Coding Quiz

Dig into the software engineering concepts that interviews and day-to-day work rely on. GapfyreSWE is a training app for developers: over 3,500 questions across 70+ categories, spanning design patterns, SOLID principles, data structures, concurrency, system design, databases, cloud and the rest of the working stack — written to be answered in a spare five minutes rather than a study session. Dig deeper with AI Every question you review carries a "Dig deeper" link. It opens your chosen assistant — Claude, ChatGPT, Copilot, Gemini or Grok — with the question, your answer and the explanation already written out. You ask the follow-up; you do not retype the context. Four kinds of question • Multiple choice — the fundamentals, and why the other three answers are wrong. • Fill the missing line — a snippet with a hole in it, which you cannot bluff. • Order the lines — reassemble a function from shuffled lines. • Spot the bug — real code with one thing wrong in it. Find it. Languages Bash, C, C++, C# & .NET, Go, Java & JVM, JavaScript, Kotlin, Python, Ruby, Rust, Scala, Swift, TypeScript Frameworks Angular, ASP.NET Core, Django, EF Core, FastAPI, Hibernate & JPA, NestJS, Node.js, React, Spring Boot, Vue Infrastructure and cloud AWS, Azure, CI/CD, Cloud Computing, Docker, GCP, Git, Kubernetes, Observability & SRE, Terraform Data and messaging GraphQL, gRPC, Kafka, Message Queues, MySQL, NoSQL Databases, PostgreSQL, Redis, REST API Design, SQL, SQL Queries Runtimes and the web Browser & DOM, CLR & GC, CPython Runtime, Go Runtime, HTTP & the Web, JVM & GC, Networking, V8 & Event Loop Fundamentals Algorithm Patterns, Complexity, Concurrency, Data Structures, Design Patterns, Distributed Systems, General CS, Machine Learning & AI, OOP Concepts, Security, SOLID Principles, Software Process, System Design, Testing & QA Code-reading drills Coding Challenges, Predict the Output, Spot the Bug, Spot the Inefficiency, Spot the Vulnerability, What Breaks This? GapfyreSWE Pro An optional annual auto-renewing subscription that unlocks every level in every topic and removes adverts. Payment is charged to your store account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period, and can be managed or cancelled in your store account settings. Terms of Use (EULA): https://gapfyre.com/terms Privacy Policy: https://gapfyre.com/privacy